Every iPhone user has had that sinking feeling after glancing at the device’s battery meter and seeing that it has dropped dramatically. It’s usually the result of some app running in the background, sucking the battery life out of your phone.

Unfortunately, Apple’s iOS doesn’t tell you much about which apps are the culprits (thoughthat will change in iOS 8). But now a new app from Kuro Labs called Normal gives you insight into which programs are battery hogs.

Normal works by gathering anonymized information about the behavior of iOS apps, then compares what’s running on your own iPhone or iPad. If it spots a known battery hog, it provides suggested actions you can take, along with information about how much battery life you’d save by taking those actions.

In most cases, Normal will suggest you kill the app using iOS’s multitasking feature (double-click the Home button to see a list of recently launched apps). You can see examples of how this works in the slideshow above.

Normal, which costs 99 cents, takes some time to work. When I initially installed it on my iPhone 5, it listed no active apps (it was first thing in the morning, and I’d not launched any apps yet). It listed two apps as “Other”: Tweetbot, my preferred Twitter app, and something called “Good Morning”, which doesn’t exist as an app on my phone.

Later, a third item showed up in that “Other” category: iPhone. Oookay. . .

Once I started launching apps, some began to be flagged. Facebook and its associated (and controversial) Messenger app were immediately flagged as battery hogs – I killed them from the multitasking bar, supposedly saving hours of battery life. I then launched Snapchat, which my family uses to send me silly pictures and videos, which was also flagged as a battery hog.

Normal seemed to ignore standard Apple apps such as Safari and Mail. And some apps that I expected would be battery killers – such as The Weather Channel app – didn’t get flagged.

The app supposedly gets better as it learns more about the apps on your phone. And as more people download and install it, the data it collects will be more accurate.

If you’ve got battery issues on your iPhone or iPad, download this app and give it a try. Be sure to look at the battery-saving tips in it and try those as well. Let us know in the comments if Normal is useful for you.